Question

Evaluate the expression when $a=10$ . $a^2-18$ =

Answer 1

When a=10, the expression a^2 - 18 is evaluated by squaring 10 to get 100, then subtracting 18 to obtain the answer, which is 82.

Step-by-step explanation:

To evaluate the expression a2 - 18 when a=10, you follow these steps:

1. Substitute the value of a into the expression, so it becomes 102 - 18.
2. Calculate 102, which is 100.
3. Subtract 18 from 100, which gives you 82.

Therefore, when a=10, the expression a2 - 18 equals 82.